None really stand out to me, I'd try to go into portrait orientation instead of landscape. Also a little more dynamic lighting. But the best one is 2 because its not as bland but could use a lower a f/stop number.

#1 - Looks underexposed and the brick wall wasn't a real good choice for a background. Image looks too "cool", needs to be warmed up a bit.

#2 - White balance looks good on this shot but the subject is centered. You might want to crop in tighter to get rid of the unnecessary stuff like the dead space above him.

#3 - It's okay to cut off hair if you're cropped in tight. Try shooting in portait orientation next time. Image could be warmed up a little more. Good expression.

#4 - Would have been better with subject on the left side of the frame. B&W conversion needs more contrast...seems really flat as is.

#5 - Centered subject. Expression on face makes this look like a mug shot. Don't care for the PP work on this one. Could be warmed up a bit.

I like that you're shooting from the subject's eye level instead of shooting down at him. For portrait type shots turn the camera 90 degrees and shoot in portrait orientation unless you have a specific reason to shoot in landscape orientation.